<!DOCTYPE html>
<html>
    <head>
        <title>Leaflet debug page</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.3/dist/leaflet.css" integrity="sha512-07I2e+7D8p6he1SIM+1twR5TIrhUQn9+I6yjqD53JQjFiMf8EtC93ty0/5vJTZGF8aAocvHYNEDJajGdNx1IsQ==" crossorigin="" />
        <script src="https://unpkg.com/leaflet@1.0.3/dist/leaflet-src.js" integrity="sha512-WXoSHqw/t26DszhdMhOXOkI7qCiv5QWXhH9R7CgvgZMHz1ImlkVQ3uNsiQKu5wwbbxtPzFXd1hK4tzno2VqhpA==" crossorigin=""></script>
        <link rel="stylesheet" href="css/screen.css" />
        <link rel="stylesheet" href="css/MarkerCluster.css" />
        <link rel="stylesheet" href="css/MarkerCluster.Default.css" />
        <script src="js/leaflet.markercluster-src.js"></script>
        <script src="js/realworld.388.js"></script>
    </head>
    <body>
        <div id="map"></div>
        <span>Mouse over a cluster to see the bounds of its children and click a cluster to zoom to those bounds</span>
        <script type="text/javascript">
            var tiles = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
                    maxZoom: 18,
                    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, Points &copy 2012 LINZ'
            }),
            latlng = L.latLng(-37.82, 175.24);
            var map = L.map('map', {center: latlng, zoom: 13, layers: [tiles]});
            var markers = L.markerClusterGroup();
            for (var i = 0; i < addressPoints.length; i++) {
                var a = addressPoints[i];
                var title = a[2];
                var marker = L.marker(new L.LatLng(a[0], a[1]), { title: title });
                marker.bindPopup(title);
                markers.addLayer(marker);
            }
            map.addLayer(markers);
        </script>
    </body>
</html>
>